last month's attack on the department of energy only recently came to light when employees were notified hackers hacked serve he is. the apparent ease in which nations appear to be infiltrating heavily secured sites and u.s. military and intelligence community on notice. >> this is a whole new arena a new frontier where people are able to move with stealth, agility and invisibly. i think that is what forces you to be on your toes and apprehensive and to really redouble your efforts to protect yourself. >> fox news is told a national estimate has authoritative documents commissioned to focus on cyber security with an analysis of china and others perceived after such as iran and north korea. the state department says the very real threat to economic and national security is consistently being raised with beijing. >> we have been clear with the government of china that we need to continue to talk about this. this is unfortunately a substantial and growing concern. >> after white house spokesman jay carney said he would not testify on documents later this week white house advisor john brenne